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/wɛːɹʌnˈtuː/ · adverb
(archaic or formal, sometimes interrogative) Unto what or which; to what purpose..
I will retire as soon as you have told Whereunto leadeth this lost thread of gold.
[…] for that they were content somewhat to unwrest the sovereignty from the height whereunto he had strained it; which brought the state to a better proportion of harmony.
Use whereunto when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Whereunto means (archaic or formal, sometimes interrogative) Unto what or which; to what purpose..
Common synonyms include whereto.
The opposite depends on the specific sense.
I will retire as soon as you have told Whereunto leadeth this lost thread of gold.
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